Method for estimating the angular position of a target by radar detection and radar implementing said method

摘要

A method of estimating the angular position θc of a target detected by a radar equipping a mobile carrier and emitting, via an steerable antenna, a signal, in the form of pulses, towards the target and receiving echoes from the reflection of said signal on the target, comprises: estimating, for each pulse or group of pulses of time index i, the angular position θ(i) of the antenna; estimating, for each pulse or group of pulses of time index i, the Doppler frequency fD(i) of the echo or echoes received; pairing, for each pulse or group of pulses of time index i, the angular position θ(i) and the Doppler frequency fD(i); and, estimating the angular position θc at least by solving the equation;λ⁢⁢fD⁡(i)2=Va⁢sin⁢⁢θ⁡(i)⁢(θc-θ⁡(i))+Vr,c,
where λ is the wavelength of the radar, Va is the norm of the speed of the carrier and Vr,c is the radial speed of the target.

主权项

1. A method of estimating an angular position θc of a target detected by a radar equipping a mobile carrier, said radar emitting, via a steerable antenna, a signal in the form of pulses towards the target and receiving echoes from reflection of said signal on the target, the method being executed by the radar and comprising:
estimating, for each pulse or group of pulses of time index i, an angular position θ(i) of the antenna, estimating, for each pulse or group of pulses of time index i, a Doppler frequency fD(i) of the echo or echoes received, pairing, for each pulse or group of pulses of time index i, the angular position θ(i) and the Doppler frequency fD(i), and estimating the angular position θc of the target at least by solving the equationλ⁢⁢fD⁡(i)2=Va⁢sin⁢⁢θ⁡(i)⁢(θc-θ⁡(i))+Vr,c,in which λ is a wavelength of the radar, Va is a norm of a speed of the carrier and Vr,c is a radial speed of the target,
wherein the equationλ⁢⁢fD⁡(i)2=Va⁢sin⁢⁢θ⁡(i)⁢(θc-θ⁡(i))+Vr,cis solved by minimizing mean square errorE⁡(θc,Vr,c)=∑i=1N⁢⁢(Va⁢sin⁢⁢θ⁡(i)⁢(θc-θ⁡(i))+Vr,c-λ⁢⁢fD⁡(i)2)2,in which N is a number of the pulses or of the groups of pulses, and the angular position θc and the radial speed Vr,c of the target are equal to a constant over N.